1 files changed, 1 insertions, 0 deletions
diff --git a/perl.h b/perl.h
index 7d7e2574b2..665324a0df 100644
--- a/perl.h
+++ b/perl.h
@@ -3015,6 +3015,7 @@ typedef pthread_key_t	perl_key;
 #  endif
 #endif
  
+/* not used; but needed for backward compatibilty with XS code? - RMB */ 
 #ifndef UVf
 #  define UVf UVuf
 #endif